Pipe nipple chuck



Oct. 20, 1953 A. L. FLADUNG PIPE NIPPLE CHUCK Filed June 30, 1952INVENTOR. #15527 L 540106 By irrakmr) l atentecl Get. 20, 1953 UNITEDrENT OFFICE 4 Claims.

This invention relates to a pipe nipple chuck, and has for its principalobject the provision of means for supporting short pipe lengths to bethreaded to form pipe nipples. With the usual pipe chuck, it is notpossible to out what are known as short and close nipples. This is dueto the fact that conventional die stocks are provided with guide sleeveswhich rotate about the pipe to guide the threading dies thereon. It istherefore impossible in the usual chuck to cut and thread a nipple whichis shorter than the guide sleeve on the die stock.

The principal object of this invention is to provide a device which willsecurely support a short nipple within the guide sleeve of the die stockso that the threading dies may reach and thread the nipple, regardlessof the shortness of the latter.

Another object of the invention is to so construct the nipple chuck thatit can be preset to thread nipples of any desired length and which canthread close nipples, that is, nipples in which the threads at the twoextremities of the nipple contact each other.

A further object is to provide a nipple chuck for cutting close andshort nipples which can be mounted in the usual pipe-threading machines,or which can be held in either a conventional pipe vise or a standardmachinists vise.

Other objects and advantages reside in the detail construction of theinvention, which is designed for simplicity, economy, and efliciency.These will become more apparent from the following description.

In the following detailed description of the invention, reference is hadto the accompanying drawing which forms a part hereof. Like numeralsrefer to like parts in all views of the drawing and throughout thedescription.

In the drawing:

Fig. 1 is a top view of the improved nipple chuck;

Fig. 2 is a longitudinal section therethrough, taken on the line 2-2,Fig. 1; v

Fig. 3 is a cross-section therethrough, taken on the line 3-3., Fig. 1;and

Fig. 4 is a side view of an adapter bushing which may be used with theimproved chuck.

The improved nipple chuck comprises a tubular barrel It having anenlarged, cylindrical cup II formed on its forward extremity andpreferably provided with threads I2 at its rearward extremity and withflat wrench or vise-engaging flat faces 28. The cup II is of largerdiameter than the barrel I0 and is provided with internal I 2 threads I3of the proper diameter and pitch to fit the pipe threads of the largestpipe for which the particular chuck is designed.

The bottom of the cup II terminates in a shoulder I4 against which aclamping disc I5 rests. The clamping disc is formed on the forwardextremity of an elongated plunger IE, which is slidably mounted withinthe barrel I6. The mid-portion of the plunger I6 is reduced in diameter,as illustrated, to reduce weight and to provide operating space for alimit screw H which is threaded through the wall of the barrel I0 intothe cut-away portion of the plunger It to limit the amount of forwardmovement of the plunger.

The plunger It may be urged forwardly in the barrel III by means of aneccentric cam I8 formed or mounted on a transversely extending cam shaftI9. The cam shaft extends diametrically through and projects outwardlyat both sides of the barrel Iii. Both extremities of the cam shaft areformed with wrench-engaging heads 29, preferably provided with turningpin openings 2 I. It can be readily seen that rotation of the shaft I9will cause the cam I8 to force the plunger and the clamping disc I5forwardly in the barrel I 0.

A tubular die stock guide sleeve 22 is slidably mounted on the barrelI0. The external diameter of the cup II corresponds to the internaldiameter of the sleeve 22, and an inwardly extending annular boss 23 isformed on the inner extremity of the sleeve to slide upon the barrelII]. The sleeve 22 may be locked in any desired position on the barrelI0 by means of a suitable set screw 24 preferably having a reciprocatinglever handle 25.

Let us assume it is desired to cut and thread a nipple of a diametercorresponding to the internal threads I3. The end of a piece of pipe isthreaded, and the pipe is cut off to the desired nipple length. Thethreaded piece is screwed into the threads I3, as indicated in brokenline at 26 in Fig. 2. The cam shaft I9 is rotated to force the plungerforwardly. This acts to clamp the clamping disc I5 against the threadedextremity of the pipe piece to securely lock it in the threads I3 so asto prevent rotation of the pipe piece in either direction. The sleeve 22is then moved along the barrel I0 until the outer edge of the sleevealigns with the inner limit of the threads to be formed on the nipple.The guide sleeve of a conventional die stock is then slipped over thedie stock guide sleeve 22 until the dies engage and cut threads on theprojecting extremity of the pipe piece 26 as indicated at 21 in Fig. 1.

To thread nipples of smaller diameter than the threads I3 reducingbushings are used. Such a bushing is illustrated in Fig. 4 and consistsof a hexagonal head 29 with a projecting, externally threaded portion30. The bushing is internally threaded as indicated in broken line at 3|to receive the pipe piece from which the nipple is to be formed. Thethreaded portion. 30 is designed to thread into the threads l3 of thechuck with the hexagonal head 29 clamped against the rim of the cup Hwithin the outer guide sleeve 22. A plurality of bushings are provided:

each chuck. For instance, the threads I3 will be standard for 2" pipeand 2" bushings will bepro vided having internal threads. 3| for. 1 1",and pipe.

The threads l2 on the barrel H) are designed to fit the threads of thechuck holder of a conventional: pipe threading. machine if it. isdesired to use the chuck on such a machine. The ex tremity of thebarrel; however; can begrippedfi in any suitable vise, where a pipethreading: machine is not available; or the: die stock may be heldSta-.- tionary and the chuck. rotatedby means of asuit able wrenchengaging theaflat faces 28.

While a speoificform: of the improvementihas been described and;illustrated: herein, it: is to be understood: that the sarne may-v be:varied; within the scope ofthe appendedlclaimswithout departing from thespirit of the-invention;

Having-thus described the invention, what is claimed and desired securedby LettersPatent is:

1. A pipe nipple chuck for use with a die-stock comprising:- atubularbarrel; acup-shaped, internally-threaded socket formed on the outerextremity of saidbarrel to -receive=a piece of 1 pipe adie-stockguidesleeve slid'ably-"mounted on said barrel sothat it may be. projectedoutwardly beyond the outer extremity of said barrel to receive saiddie-stock; means carried by said guide sleeve and engaging said barrelto lock the former in any desired longitudinal position on the latter; aplunger slidably mounted in said tubular barrel; and means carried bysaid barrel and acting against said plunger to force the latter againstthe extremity of the piece of pipe in said cupshaped socket.

2-. A pipe. nipple chuck asdescribed inv claim 1 having a clamping discformed on said plunger within said socket and positioned between saidplunger and said piece of pipe to contact the latter.

3. A pipe nipple chuck as described in claim 2 in which the means actingagainst said plunger comprisesa. diametrically extending cam shaftrotatably mounted in said barrel inwardly of said plunger, said camshaft projecting outwardly from said barrel; an eccentric cam on saidcam shaftwithin sai'd barrel; and: means for rotating saidcamshaft-from: theexterior' of said barrel to force said cam againsttheinner'extremity of said plunger;.

4. Apipemipplec'huck-asdescribed in claim 3 having threads formed onitheinner extremity of said barrelv for mounting the. latter in apipethreading machine. and having wrench engaging meansiformedonitheprojecting extremity of said cam shaftli 01 rotating: the: lattenALBERT L. FLADUNG';

References Cited in the file of this patent UNITED STATES PATENTS Number

